Semi-mounted plow

ABSTRACT

A semi-mounted moldboard plow connected to the draft links of a tractor by a hitch having longitudinal, upright and transverse pivotal movements with respect to the frame of the plow. The hitch is connected to a tail wheel of the plow so that the wheel turns in the direction of movement of the tractor. Each plow bottom of the plow is held in the ground working position by a hydraulic holding, release and return mechanism. Fluidly coupled with the hydraulic mechanism of each plow bottom is a fluid cylinder which yieldably holds a colter in ground working position.

United States Patent Geurts Jan. 8, 1974 1 SEMI-MOUNTED PLOW 2,985,2465/1961 Shipp 172/284 3,061,020 10 1962 M h [75] Inventor: Cletus J.Geurts, Gwmner, N. Dak. 3,228,484 111966 g gi Assignee: Gems Mimeapcmtiiiil Z1133? iiZflLifi'i'h'jiiji: 172,285 [22] Filed: Apr. 29, 1971 [21]A N 138,827 Primary Examiner-Robert E. Pulfrey Assistant Examiner-PaulT. Sewell Related US. Application Data Atmmey L Paul Burd et [60]Continuation-impart of Ser. No. 486,712, Sept. 13, 1965, Pat. No.3,642,074, Division of Ser. No. 666,047, Sept. 7, 1967, Pat. No.3,642,073. [57] ABSTRACT A semi-mounted moldboard plow connected to the[52] Cl 0 7 draft links of a tractor by a hitch having longitudinal, 5]1 I t Cl Aolb 69/00 upright and transverse pivotal movements withrespect n 59/042 to the frame of the plow. The hitch is connected to a58 Id f S h 72 285 286 tail wheel of the plow so that the wheel turns inthe l 1 1e 0 l direction of movement of the tractor. Each plowbotl72/288, Z96I7,SZ%6 tom of the plow is held in the ground workingposition by a hydraulic holding, release and return mechanism. [56]References Cited Fluidly coupled with the hydraulic mechanism of eachUNITED STATES PATENTS plcl w bottom is: fluili cylinde l which yieldablyholds 21 2,208,526 *7/1940 Gurries 172/413 com m wor mg 3,428,136 2/1969Johannsen et a1. 172/285 2,968,356 H1961 Mydels 172 417 12 Clams 6Drawmg F'gures /6 r 7a 3 I I, #5 i s/ 59 69 2 glllll 7 4 72 E 7/ 9 egg;

PMEMEBJAN slam SHEH 1 0f 3 SEMI-MOUNTED PLOW This application is acontinuation in part of U.S. application, Ser. No. 486,712, Filed: Sept.13, 1965, now U.S. Pat. No. 3,642,074. This application is also adivision of U.S. application Ser. No. 666,047, filed Sept. 7, 1967, nowU.S. Pat. No. 3,642,073.

BACKGROUND OF INVENTION Semi-mounted plows having tail wheels steeringhitches have been developed to turn the plows with the towing tractors.An example of a plow with a tail wheel steering hitch is shown in U.S.Pat. No. 3,228,484. A number of plows have also been equipped with triprelease mechanism for the plow bottoms and spring cushions for thecolters. The U.S. Fat. to Geurts No. 3,032,122 is a combined mechanicaland hydraulic pressure trip release for a plow bottom. In U.S. Pat. No.3,642,073 and No. 3,642,074. a completely hydraulic system is used tohold, to release and to return the plow bottom to the earth workingposition. The present invention is a complete semi-mounted plow having atail wheel steering hitch, a hydraulic system to hold, release andreturn both the plow bottoms and colters to ground working positions,and independent hydraulic cylinders to raise and lower opposite ends ofthe plow.

SUMMARY OF INVENTION One feature of the invention relates to an earthworking implement equipped with a pivoting hitch connected to a wheelfor steering the wheel. The hitch is free to pivot in longitudinal,upright and transverse directions so that both the tractor and implementcan pitch, roll and turn without altering the effectiveness of theimplement. A separate hydraulic cylinder attached to support links forthe wheel is used to raise and lower the implement frame.

IN THE DRAWINGS FIG. 1 is a plan view of the semi-mounted plow of theinvention;

FIG. 2 is an enlarged side view of hitch of the plow of FIG. 1;

FIG. 3 is a sectional view taken along the line 33 of FIG. 2;

FIG. 4 is an enlarged sectional view taken alongthe line 44 of FIG. 1;

FIG. 5 is an enlarged plan view of the hydraulic holding, release andreturn system for the plow bottom with parts broken away to show thehydraulic holding and release assembly for the colter; and

FIG. 6 is an enlarged sectional view taken along the line 66 of FIG. 1.

Referring to the drawings there is shown in FIG. 1, a semi-mounted plowindicated generally at 10 connected to draft arms 11 of a conventionalthree point hitch on a tractor. Plow 10 has a frame 12 pivotallyconnected to a steering hitch 13. A tail wheel assembly indicatedgenerally at 14 mounted on the rear portion .of the frame is connectedin a steering relation with hitch 13. The opposite end of the frame isattached to a furrow wheel ssembly 16. Between the tail wheel asssemblyl4 and furrow wheel assembly 16 a plurality of moldboard plow bottomsindicated generally at 17 are attached to the frame by separatehydraulic holding, release and return mechanisms indicated generally at18. Each mechanism 18 is connected to a longitudinal draft beam 19secured to the frame. Associated with each d'raft beam 19 is a rotatingdisc colter 20 and a hydraulic holding, release and return assembly 21for biasing the colter in the ground working position.

Frame 12 comprises an oblique main beam 22 and a forwardly projectedhitch bar 23. Beam 22 may be of box-shape or tubular construction. Thedraft beams 19 secured to the bottom side of main beam 22 have portionsthat extend in a forwardly direction. The hitch bar 23 is secured to themid-portion of beam 22. A second oblique beam 24 secured to the forwardends of draft beams 19 and the underside of hitch bar 23 provideslateral stability and reinforcement for the draft beams as well as thehitch bar. A brace 25 connects one side of hitch bar 23 with beam 24.Secured to the rear ends of beams 22 and 24 is a longitudinal end beam26 carrying a lift unit indicated generally at 27 for tail wheelassembly 14. The opposite or forward ends of beams 22 and 24 areconnected to a longitudinal front end beam 28 carrying a lift unitindicated generally at 29 for furrow wheel assembly 16.

Referring to FIG. 2, hitch 13 has an upright plate 31 located adjacentthe forward end of hitch bar 23. Secured to the mid-portion of the backof plate 31 is a longitudinal shaft 32 telescoped through sleevebearings 33 and 34. Bearings 33 and 34 are secured to the bottom side oftehe forward end of hitch bar 23. A collar 36 mounted on the end ofshaft 32 holds the shaft in assembled relation with the sleeves 33 and34 allowing the hitch to rotate about a horizontal axis extended in thedirection of the hitch bar 23. Located below shaft 32 is a rearwardlyextended pivoted link 37 having a clevice 38 at its forward end. Anupright pin 39 projected through suitable holes in clevice 38 and a tab41 secured to the bottom of plate 31 pivotally connects the forward endoflink 37 to the plate 31. A similar clevice 42 is secured to theopposite end of link 37. An upright pin 43 connects clevice 42 with anoffset bracket 44 attached to the bottom of beam 24. Link 37 stabilizesthe plate 31, reduces the force on shaft 32 and allows limited rotationof the plate about the axis of shaft Secured to the front face of plate31 is an upright tubular member or sleeve 46 carrying an upright shaft47. A top collar 48 and a bottom collar 49 secured to opposite ends ofshaft 47 maintain the shaft in assembled relation with tubular member46. Attached to the bottom of shaft 47 is bottom transverse crossbar 51.As shown in FIG. 3, the ends of crossbar 51 pivotally carry cylindricalmembers 52 and 53 attached to links 54 and 56. Retaining members 57 and58, as cotter pins, maintain the cylindrical members on bar 51.Returning to FIG. 1, the opposite ends of links 54 and 56 are secured tocylindrical members 59 and 61 rotatably mounted on a transverse draftbar 62. A plurality of spacers 63 on the mid-section of bar 62 maintainthe cylindrical members 59 and 61 in a spaced relationship on bar 62.The ends of the bar 62 are carried in the hooks or pockets in the endsof the draft arms to allow the hitch to have transverse horizontalrotational movement with respect to the draft arms.

Secured to the top of shaft 47 is a top crossbar. 64 extendedtransversely in the same plane as bottom cross bar 51. Top crossbar 64is connected to the transverse draft bar 62 by a pair of adjustable linkmembers 66, 67 and 72, 73. As shown in FIG. 1, an upper plate 66 secured.to a sleeve 68 rotatably mounted on one end of top crossbar 64 isaligned with a lower plate 67 secured to a sleeve 69 rotatably carriedon the draft bar 62. A plurality of fastening means 71, as nut and boltassemblies, projected through a pair of a plurality of holes in theplates 66 and 67 secure the plates together forming an adjustable link.Similar plates 72 and 73 secured to sleeves 74 and 76 connect the draftbar 62 with the top bar 64. Fastening means 77 adjustably secure plates72 and 73 together. The link members are adjustable in length to changethe elevation of the draft bar thereby adjusting the line of draft ofthe hitch. One end of crossbar 64 carries an upright pin 78 used topivotally mount a clevice 79 attached to a rearwardly extended steeringrod 81 for the tail wheel assembly 14.

Referring to FIGS. 1 and 4, lift unit 27 for the tail wheel assembly 14comprises an upright channel 82 secured to the end of beam 26. Projectedrearwardly from channel 82 are a pair of spaced parallel links 83 and 84pivotally connected to an upright channel 86. Transverse pivot pins 87,88, 89 and 91 pivotally connect opposite ends of links 83 and 84 to thechannels 82 and 86 respectively.

Secured to the back of channel 86 is an upright sleeve 92 carrying ashaft 93. The lower end of the shaft projects downwardly and inwardlyforming an axle for tail wheel 94. The shaft 93 and wheel 94 comprisethe steerable caster wheel of the tail wheel assembly 14. Secured to theupper end of shaft 93 is a lateral crank arm 96 carrying a clevice 97pivotally connected to the arm by an upright pin 98. The clevice 97 issecured to the rear end of steering rod 81. Collars 99 and 101 mountedon shaft 93 maintain the shaft in vertical alignment with sleeve 92.

An upwardly projected arm 102 is secured to the top of the forward endof link 83. Arm 102 is in longitudinal alignment with a hydrauliccylinder indicated generally at 103. The cylinder is pivotally mountedbetween upright supports 104 and 106 by transverse pivots 107 secured toopposite sides of the cylinder. A pivot pin 108 connects the piston rodto the upper end of arm 102. Cylinder 103 is connected to the fluidpressure system of the tractor by a line 109 which runs along the frame12.

Mounted on the forward end of longitudinal beam 26 is a gauge wheel 111.A vertically adjustable standard 112 attached to beam 26 carries wheel111. As shown in FIG. 4, gauge wheel 111 rides on the ground leveladjacent the furrow 113 with the tail wheel 94 riding in the furrow.

Furrow wheel assembly 16 and the lift unit 29 project forwardly fromfront longitudinal beam 28. This structure is identical to the structureshown in FIG. 4 and comprises a furrow wheel 114 rotatably carried on anupright shaft 115 to form a caster wheel mounted on the forward end ofthe lift unit 29. The top of shaft 115 does not carry a steering arm. Ahydraulic cylinder 116 acting on the links connecting the beam 28 withthe caster wheel is joined to the hydraulic system of the tractor by aseparate line 117 whereby the front end of the plow frame 12 may beindependently raised and lowered by altering the supply of fluidpressure to cylinder 116.

Referring to FIGS. and 6, there is shown the hydraulic holding, releaseand return mechanism 18 connecting the moldboard plow 17 to the end ofthe horizontal draft beam 19. Mechanism 18 includes an upwardly andforwardly curved standard 118 connected to the moldboard plow bottom 17and located between a pair of upright plates 119 and 121. A plurality oftransverse nut and bolt assemblies 122 connect the plates to the end ofbeam 19. The upper end of standard 18 is pivotally connected to aforwardly extended link 123 by transverse pivot pin 124. The forward oropposite end of link 123 is secured to a transverse pivot pin 126rotatably mounted on suitable sleeve bearings secured to the plates 119and 121. Located between the plates on opposite sides of standard 118are rollers 127 and 128 rotatably mounted on transverse pin 129 extendedthrough the standard 118. Rollers 127 and 128 ride on pairs of arcuatetracks 131, 132 and 133, 134 respectively. The tracks secured to theinsides of the rear portions of the plates 119 and 121 form upwardlyextended arcuate guideways 136 and 137 for the rollers 127 and 128. Thecenter radii of the guideways lies along the transverse axis of thepivot pin 126 so that the guideways along with the link 123 control themovement of the plow bottom 17 in such a manner that when the point ofthe plow share strikes an obstruction it will raise out of the groundwithout going below the normal plowing depth or the bottom of thefurrow. Mounted on the plates 119 and 121 at the bottom of the guideways136 and 137 is a stop 138 which engages the standard 118 when the plowbottom is in the normal ground working position. Stop 138 is aneccentric member which is adjustable to change the ground working angleof the plow bottom.

Secured to the top end of standard 118 is an upright arm 139 alignedwith a hydraulic cylinder 141 carrying a piston rod 142. A bifurcatedmember 143 secured to the outer end of piston rod 142 carries atransverse pin 144 pivotally connecting the upper end of arm 139 to thepiston rod 142. Cylinder 141 is located between a pair of uprightsupports 146 and 147 secured to the top of main beam 22. Secured toopposite sides of the rod end of cylinder 141 are outwardly directedpins 148 projected through suitable holes in the upper ends of supports146 and 147 to pivotally mount the cylinder on the supports. A hydraulicline 149, as a flexible hose, is connected to the forward end ofcylinder 141 and a header line 151 coupled to a pair of accumulaters 152used to maintain a substantially even pressure on the fluid in the lines149 and 151 and the cylinder 141. Header line 151 is also coupled bysuitable lines to the other cylinders of the hydraulic holding, releaseand return mechanisms used to bias the remaining plow bottoms in theplow working positions.

As shown in FIG. 1, a connecter 153 leads from the accumulaters 152.This line is adapted to be connected to the hydraulic system of thetractor so that the hydraulic system of the tractor can be used toreplenish the pressure in the fluid system of the plow. Alternatively,the hydraulic system of the tractor can be used to provide a source ofhydraulic pressure for the hydraulic holding, release and returnmechanisms 18 for the plow bottoms 17.

Referring to FIG. 6, there is shown colter 20 and the hydraulic holdingand release mechanism 21 for yieldably holding the colter in the groundworking position forwardly of plow bottom 17. Colter 20 comprises avertical disc 154 rotatably mounted on a transverse axle 156 carried onan upwardly directed arm 157. The

.forward end of arm 157 is attached to an upright sleeve 159 rotatablycarried on an adjustable offset leg 161. The upper end of leg 161 issecured to the rearwardly directed leg of a L-shaped crank or movablemembers 162 by a clamp 163. A transverse pivot pin 164 pivotally mountsthe apex portion of crank 162 to a downwardly projected bracket 166secured to the side of beam 19. A stop 167 located forwardly of theupright arm of crank 162 limits the pivotal movement of crank 162 todetermine the ground working position of colter 154. Stop 167 is anadjustable eccentric for changing the working depth of the colter disc154.

A hydraulic cylinder 168 carrying a piston rod 169 is located adjacentthe upright arm of crank 162. The outer end of piston rod 169 ispivotally attached by a pivot pin 171 to upright arm of crank 162. Theopposite end of cylinder 168 is located between a pair of uprightsupports 172. A transverse pivot pin 173 connects the cylinder 168 tothe supports 172. A line 174, as a flexible hose, connects the head endof cylinder 168 to the line 149 so that when hydraulic fluid underpressure is supplied to the cylinder 141, cylinder 168 is also suppliedwith fluid under pressure. When fluid under pressure is supplied tocylinder 168, piston rod 169 biases the upright arm of crank 162 inengagement with the stop 167 thereby holding the colter disc 154 in theground working position.

On operation, the plow is lowered into the ground working position byallowing fluid to escape from the cylinders 103 and 1 16 together withthe lowering of the draft links 11. This lowers the frame 12 moving theplow bottoms 17 in the ground working positions. The tail wheel assembly14, the furrow wheel assembly 16, and the draft links 11 may beindependently moved to sequentially move the plow bottoms into groundworking position as well as providing the plow frame with properleveling.

On application of fluid pressure to the cylinders 141 and 168 of each ofthe hydraulic holding release and return mechanisms 18 and 21 associatedwith each plow bottom and colter will force and hold the plow bottomsand colters in ground working positions. The cylinder 141 holds thestandard 118 in engagement with the stop 138. In similar manner cylinder168 holds the crank 162 in engagement with the stop 167. Thus, thecylinders 141 and 168 concurrently hold both the plow bottom 17 andcolter in the ground working position through the use of a common sourceof fluid pressure. The cylinder 168 for the colter can'be coupled to anindependent source of fluid under pressure and used with plows which donot have a hydraulic trip for the plow bottoms.

When the colter disc 154 engages an obstruction, as a rock, it willpivot upwardly against the pressure of the fluid in the cylinder 141over the obstruction. In a similar manner, plow bottom 17 striking anobstruction will move upwardly and rearwardly without going below theplow depth to clear the obstruction. The rollers 127 and 128 ride in theguideways formed by the upright curve tracks while the link 123 pivotsupwardly about the pivot pin 126. The fluid pressure in the cylinder 121provides a yielding force which will return the plow bottom 17 andcolter 20 back to the ground working positions after the obstructionsare cleared. This is accomplished without stopping the forward motion ofthe plow or placing extreme lifting forces on the plow frame.

While there have been shown and described a preferred embodiment of theplow of the invention, it is to be understood that various changes inthe details of the hitch, the frame, the supporting wheels for theframe, the colter, and the hydraulic holding, release and returnmechanisms for the plow bottoms and colters may be made by those skilledin the art without departing from the spirit of the invention. The termearth working implement includes but is not limited to a moldboard plow,a digger, a stubble plow, a middle buster, a cultivator, a harrow, adisc plow and like implements. The invention is defined in the followingclaims.

I claim:

1. In an implement, a frame having an elongated beam and a forwardlyextended hitch bar, means having a wheel and an upright shaft connectedto the wheel located adjacent one end of the beam for supporting the oneend of the beam, means rotatably mounting said shaft for movement abouta generally upright axis, a lateral arm secured to the shaft forrotating the shaft, lift means connecting the means rotatably mountingsaid shaft to said one end of the beam for changing the elevation ofsaid beam, said lift means comprising a first upright member attached tothe beam, a second upright member attached to the means rotatablymounting the shaft, a pair of generally parallel first links pivotallyconnected to the first upright member and the second upright member,generally upright arm means secured to one of the first links, fluidmotor means including a cylinder and a piston rod operable to change theelevationof said beam, first pivot means mounting the fluid motor meanson the first upright member, second pivot means connecting the fluidmotor means to the arm means whereby movement of the piston rod relativeto the cylinder changes the elevation of the beam, hitch means securedto the frame, said hitch means comprising a first member rotatablymounted on the hitch bar for rotation about a horizontal axis generallyparallel to the hitch bar, a second member mounted on the first member,said second member being rotatable about a generally upright axis, alaterally directed bar connected to the second member, rod meansconnected to the laterally directed arm and laterally directed barwhereby the shaft is rotated to steer the wheel on relative movementbetween the hitch means and the frame about said generally upright axis,a transverse member connectable to draft links of a tractor, link meansconnecting the second member with the transverse member, and means toadjust the length of the link means. I

2. The implement of claim 1 wherein: the means rotatably mounting saidshaft comprises an upright sleeve, said shaft rotatably positioned inthe sleeve and said shaft having at the lower end thereof generallyhorizontal axle means for the wheel.

3. The implement of claim 1 wherein: said link means includes a pair ofsecond links connected to adjacent ends of the second member and thetransverse mem her.

4. The implement of claim 1 wherein: the first upright member is a firstupright channel and the second upright member is a second uprightchannel, said first and second channels having open sides facing eachother and accommodating the opposite ends of the links.

5. The implement of claim 1 wherein: the first links comprise an upperlink and a lower link, said arm means secured to and projected upwardlyfrom the upper link.

6. The implement of claim 1 wherein: the first pivot means mounts thecylinder on upper portions of the first upright member, and the secondpivot means connects the piston rod to the arm means.

7. The implement of claim 1 wherein: said second member comprises anupright sleeve secured to the first member and a shaft rotatably mountedin the sleeve, said bar secured to the top of the shaft rotatablymounted in the sleeve, a second bar secured to the bottom of the shaftrotatably mounted in the sleeve, said link means comprising upper andlower second links connecting the bars to the transverse member.

8. The implement of claim 7 including means rotatably connecting thelinks to the second bars and transverse member.

9. In an implement, a frame having an elongated beam, means having awheel and an upright first shaft connected to the wheel located adjacentone end of the beam for supporting the one end of the beam, meansrotatably mounting said first shaft for movement about a generallyupright axis, a lateral arm secured to the first shaft, lift meansconnected to the means rotatably mounting said first shaft to said oneend of the beam for changing the elevation of said beam, hitch meanssecured to the frame, said hitch means comprising a first memberrotatably mounted on the frame for rotation about a generally horizontalaxis extended generallyin the direction of the movement of saidimplement, a second member mounted on the first member, said secondmember being rotatable about a generally upright axis, said secondmember comprises an upright sleeve secured to the first member and asecond shaft rotatably mounted in said sleeve, 21 laterally directedfirst bar connected to the top of said second shaft, rod means connectedto the lateral arm and laterally directed first bar, a second barsecured to the bottom of the second shaft, a transverse memberconnectable to the draft links of a tractor, and link means connectingthe second member with the transverse member, said link means comprisingupper and lower links connecting the bars to the transverse member.

10. The implement of claim 9 including: means to adjust the length ofthe link means.

1 1. The implement ofclaim 9 wherein: said lift means comprises a firstmember attached to the beam, a second member attached to the meansrotatably mounting the shaft, linkage means pivotally connected to thefirst member and the second member and fluid motor means connected tothe linkage means operable to move said linkage means to change theelevation of the beam.

12. The implement of claim 11 wherein: the linkage means comprises apair of generally parallel links pivotally connected at their oppositeends to the first member and second member respectively.

37 3 'UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION 3,783,950Dated January 8, 1974 Patent No.

Inventor(s) CLETUS GEURTS It is certified that error appears in theabove-identified patent and that said Letters Patent are herebycorrected as shown below:

Column 1, line 15, "mechanism" should be -'mechanisms--.

Column 2, line 27, "tehe" should be --the.

' Claim 8,- line 2, after the word "connecting" should read --the secondlinks to the bar and transverse'member--.

Signed and sealed this 7th day of May 197M...

(1351 .1. Attest:

EDE'IAHE TLFDSTCZ-ZER IR. C, MARSHALL DANE Commissioner of PatentsAttesting Officer

1. In an implement, a frame having an elongated beam and a forwardlyextended hitch bar, means having a wheel and an upright shaft connectedto the wheel located adjacent one end of the beam for supporting the oneend of the beam, means rotatably mounting said shaft for movement abouta generally upright axis, a lateral arm secured to the shaft forrotating the shaft, lift means connecting the means rotatably mountingsaid shaft to said one end of the beam for changing the elevation ofsaid beam, said lift means comprising a first upright member attached tothe beam, a second upright member attached to the means rotatablymounting the shaft, a pair of generally parallel first links pivotallyconnected to the first upright member and the second upright member,generally upright arm means secured to one of the first links, fluidmotor means including a cylinder and a piston rod operable to change theelevation of said beam, first pivot means mounting the fluid motor meanson the First upright member, second pivot means connecting the fluidmotor means to the arm means whereby movement of the piston rod relativeto the cylinder changes the elevation of the beam, hitch means securedto the frame, said hitch means comprising a first member rotatablymounted on the hitch bar for rotation about a horizontal axis generallyparallel to the hitch bar, a second member mounted on the first member,said second member being rotatable about a generally upright axis, alaterally directed bar connected to the second member, rod meansconnected to the laterally directed arm and laterally directed barwhereby the shaft is rotated to steer the wheel on relative movementbetween the hitch means and the frame about said generally upright axis,a transverse member connectable to draft links of a tractor, link meansconnecting the second member with the transverse member, and means toadjust the length of the link means.
 2. The implement of claim 1wherein: the means rotatably mounting said shaft comprises an uprightsleeve, said shaft rotatably positioned in the sleeve and said shafthaving at the lower end thereof generally horizontal axle means for thewheel.
 3. The implement of claim 1 wherein: said link means includes apair of second links connected to adjacent ends of the second member andthe transverse member.
 4. The implement of claim 1 wherein: the firstupright member is a first upright channel and the second upright memberis a second upright channel, said first and second channels having opensides facing each other and accommodating the opposite ends of thelinks.
 5. The implement of claim 1 wherein: the first links comprise anupper link and a lower link, said arm means secured to and projectedupwardly from the upper link.
 6. The implement of claim 1 wherein: thefirst pivot means mounts the cylinder on upper portions of the firstupright member, and the second pivot means connects the piston rod tothe arm means.
 7. The implement of claim 1 wherein: said second membercomprises an upright sleeve secured to the first member and a shaftrotatably mounted in the sleeve, said bar secured to the top of theshaft rotatably mounted in the sleeve, a second bar secured to thebottom of the shaft rotatably mounted in the sleeve, said link meanscomprising upper and lower second links connecting the bars to thetransverse member.
 8. The implement of claim 7 including means rotatablyconnecting the links to the second bars and transverse member.
 9. In animplement, a frame having an elongated beam, means having a wheel and anupright first shaft connected to the wheel located adjacent one end ofthe beam for supporting the one end of the beam, means rotatablymounting said first shaft for movement about a generally upright axis, alateral arm secured to the first shaft, lift means connected to themeans rotatably mounting said first shaft to said one end of the beamfor changing the elevation of said beam, hitch means secured to theframe, said hitch means comprising a first member rotatably mounted onthe frame for rotation about a generally horizontal axis extendedgenerally in the direction of the movement of said implement, a secondmember mounted on the first member, said second member being rotatableabout a generally upright axis, said second member comprises an uprightsleeve secured to the first member and a second shaft rotatably mountedin said sleeve, a laterally directed first bar connected to the top ofsaid second shaft, rod means connected to the lateral arm and laterallydirected first bar, a second bar secured to the bottom of the secondshaft, a transverse member connectable to the draft links of a tractor,and link means connecting the second member with the transverse member,said link means comprising upper and lower links connecting the bars tothe transverse member.
 10. The implement of claim 9 including: means toadjust the length of the link means.
 11. The implement of claim 9wherein: said lift means Comprises a first member attached to the beam,a second member attached to the means rotatably mounting the shaft,linkage means pivotally connected to the first member and the secondmember and fluid motor means connected to the linkage means operable tomove said linkage means to change the elevation of the beam.
 12. Theimplement of claim 11 wherein: the linkage means comprises a pair ofgenerally parallel links pivotally connected at their opposite ends tothe first member and second member respectively.